[Illustration: AFTER MOTHER NATURE HAD SENT HEAT AWAY TO MELT UP SOME OTHER WORLDS, SHE CALLED FOR HIS BROTHER, COLD, AND COLD CAME RUSHING UP, HIS GREAT WHITE WINGS GLITTERING WITH FROST.] THE Author desires to express his thanks to Dr. William K. Gregory, of the American Museum of Natural History, as well as to the other Museum authorities, for their courtesy and assistance in the matter of illustrations, and in the preparation of the text. The book does not pretend, of course, to be a strictly scientific work. Many liberties have been taken, in order to render the subject interesting to the youthful mind. Man's early inventions did not come about so simply as is pictured in the various c…
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